#!/bin/sh

test_description='git rev-list trivial path optimization test'

. ./test-lib.sh

test_expect_success setup '
echo Hello > a &&
git add a &&
git commit -m "Initial commit" a &&
initial=$(git rev-parse --verify HEAD)
'

test_expect_success path-optimization '
    commit=$(echo "Unchanged tree" | git commit-tree "HEAD^{tree}" -p HEAD) &&
    test $(git rev-list $commit | wc -l) = 2 &&
    test $(git rev-list $commit -- . | wc -l) = 1
'

test_expect_success 'further setup' '
	git checkout -b side &&
	echo Irrelevant >c &&
	git add c &&
	git commit -m "Side makes an irrelevant commit" &&
	echo "More Irrelevancy" >c &&
	git add c &&
	git commit -m "Side makes another irrelevant commit" &&
	echo Bye >a &&
	git add a &&
	git commit -m "Side touches a" &&
	side=$(git rev-parse --verify HEAD) &&
	echo "Yet more Irrelevancy" >c &&
	git add c &&
	git commit -m "Side makes yet another irrelevant commit" &&
	git checkout master &&
	echo Another >b &&
	git add b &&
	git commit -m "Master touches b" &&
	git merge side &&
	echo Touched >b &&
	git add b &&
	git commit -m "Master touches b again"
'

test_expect_success 'path optimization 2' '
	( echo "$side"; echo "$initial" ) >expected &&
	git rev-list HEAD -- a >actual &&
	diff -u expected actual
'

test_done